238 



Annals of the South African Museum. 



genus with acute periphery, the group of " Schloenbachia" here 

 discussed would be post-Hauericeras, not pve-Hauericeras, speaking 

 phylogeuetically, and irrespective of age in other words, it would have 

 travelled farther away from the Desmoceratid stock than Hauericeras. 

 Now Nowak* proposed the new genus Prohauericeras for those 

 forms of Schloenbachia that showed a decided tendency in the direction 

 of Haut'rii-f-rax. The derivation of the latter genus from Schloenbacliia 

 (via Prohauericeras) can on no account be admitted. Hauericeras has 

 a truly Desmoceratid suture-line, as a comparison of its internal 

 sutures (Fig. A 7) with those of Puzosia p/fl?<?rtYa(Sowerby),Kossmat,t 



TEXT-FIG. A. Hauericeras gardcni, Baily, sp. Umtamvuna Kiver, Natal. 

 (B.M. No. C 18528 [17 and 9] and C 18531 [8]). 1. Suture-line at 

 diameter == 4 mm. si = siphuncle ; u = umbilicus. 2. Ditto at 6 mm., 

 without external saddle. 3. Second lateral saddle and auxiliaries at 14 

 mm. D. 4. Ditto at 20 mm. D. 5. Ditto at 50 mm. D. 6. Internal 

 (dorsal) suture-lino at diameter = 6 mm. ; AL = antisiphonal lobe ; u = 

 umbilicus. 7. Ditto at 50 mm. D, with second and third auxiliary saddles 

 of external suture-line, and umbilical saddle (u). A.L. = antisiphonal lobe. 

 8. Whorl-fragment at D = 90 mm., K == hollow keel, on barely carinate 

 venter of cast. (Photo, by Gr. C. Crick.) 9. Outline whorl- section atD = 

 75 mm., showing hollow keel and rounded inner whorls. All the figures 

 are enlarged. 



will show. The inner branch of the second lateral saddle, that is so 

 conspicuous a feature of the development of the suture-line of 

 Hauericeras gardem (see Fig. A 1-5)+ is similarly developed in many 

 forms of Puzosia (e. g. subplanulata, Schliiter, compressa, indopacijica, 



* " Unters. Ceph. Ob. Kreide Polen., Ill," ' Biill. Ac. Sci. Cracovie,' June, 

 1913, p. 370. 



t Loc. cit. (1898), pi. xvi, fig. 4. 



J The specimen (B.M. No. C18528) from which these figures were drawn, 

 agrees in all respects with Baily's type (B.M. Geol. Soc. Coll., No. 11370), 

 and the larger of the two fragmentary co-types (No. 11371) from which Baily's 

 figure of the suture-line was taken. Some Japanese examples of H. gardeni in 

 the British Museum (Geol. Soc. Coll.) also show this peculiarity of the suture- 

 line, figured by various authoi-s, in exactly the same manner. 



